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| obsta principiis (L) ＝principiis obsta. |
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| oderint dum metuant (L) Let them hate so long as they fear. — Accius, Atreus, Fragment 4 (cf. Cicero: Orationes Philippicae 1: 14: 34). |
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| odi profanum vulgus et arceo (L) I hate the vulgar rabble and keep them far away. — Horace, Odae 3: 1: 1. |
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| O fama ingens, ingentior armis! (L) O great by fame, greater in arms. — Virgil, Aeneis 11: 124. |
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| O fortunatos nimium, sua si bona norint, agricolas (L) O too happy farmers, if they but knew their blessings. — Virgil, Georgica 2: 458. |
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| ohne Hast, (aber) ohne Rast (G) without haste, without rest (Goethe のモットー; もと太陽についてのべた言葉). |
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| omne ignotum pro magnifico (L) Everything unknown is thought to be splendid. — Tacitus, Agricola 30. |
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| omne tulit punctum qui miscuit utile dulci (L) He has gained every point who has blended the useful and the agreeable. — Horace, Ars Poetica 343. |
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| omnia mors aequat (L) Death renders all equal. — Claudianus, De Raptu Proserpinae 2: 302. |
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| omnia munda mundis (L) To the pure all things are pure. — Titus 1: 15. |
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| omnia praeclara (sunt) rara (L) All excellent things are rare. — Cicero. |
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| omnia vanitas (L) All is vanity. — Eccles. 1: 2. |
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| omnia vincit amor, nos et cedamus amori (L) Love conquers all things, let us, too, yield to love. — Virgil, Eclogae 10: 69 (cf. amor vincit omnia). |
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| omnia vincit labor (L) ＝labor omnia vincit. |
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| omnibus idem (L) the same to all men — Virgil, Aeneis 10: 112. |
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| omnis amans amens (L) Every lover is demented. |
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| omnis homo mendax [mendacium] (L) All men are liars. — Ps. 116: 11 (Vulgate では 115: 11). |
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| on conna t l'ami au besoin (F) ＝au besoin l'on connat l'ami. |
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| onus est honos (L) Honour is a burden. — Varro, De Lingua Latina. |
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| opprobrium medicorum (L) the reproach of physicians (不治の病気について言う). |
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| optat ephippia bos piger, optat arare caballus (L: the lazy [fat] ox desire horse's trappings, and the horse desires to plow) No one is content with his condition. — Horace, Epistulae 1: 14: 43. |
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| O quam cito transit gloria mundi! (L) O how quickly passes away the glory of the world! — Thomas  Kempis, De Imitatione Christi 1: 3: 6. |
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| orator fit, poeta nascitur (L) An orator is made, a poet is born. (cf. poeta nascitur…) |
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| ore rotundo (L: with rounded mouth) with wellturned speech; eloquently — Horace, Ars Poetica 323. |
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| oro y plata (Sp.) gold and silver (米国 Montana 州のモットー). |
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| O sancta simplicitas! (L) O sacred simplicity! (John Huss の最後の言葉; 主に無邪気な言行を冷笑する時に用いる) |
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| O tempora! O mores! (L: o the times! o the manners!) What an age we live in! — Cicero, Orationes in Catilinam 1: 1: 2. |
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| otia dant vitia (L) Leisure begets vice. (cf. homines nihil agendo discunt malum agere) |
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| ouketi pista gunaixin (Gk) No longer are women trustworthy. — Homer, Odyssea 11: 456. |
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